GetDateOfNextOccurrence メソッド (AppointmentRecurrence)

指定した startDateTime の前ではないシリーズの次の発生の日付を返します。

シンタックス

Visual Basic

'宣言
 
Public Overrides Function GetDateOfNextOccurrence( _
   ByVal startDateTime As Date _
) As Nullable(Of Date)

C#

public override Nullable<DateTime> GetDateOfNextOccurrence( 
   DateTime startDateTime
)

パラメータ

startDateTime

検索が始まる日付。

戻り値の型

DateTime、または指定した startDateTime で発生しなかった場合は null。

使用例

Visual Basic

Imports System.Collections.Generic
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinSchedule
Imports System.Diagnostics

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        '  Create a new DateRecurrence on which the dialog session will be based.
        Dim recurrence As DateRecurrence = New DateRecurrence(New DateTime(DateTime.Today.Year, 1, 1))
        recurrence.RangeEndDate = New DateTime(DateTime.Today.Year, 12, 31)

        '  Create and show the RecurrenceDialog in DateRecurrence mode
        Dim dialog As New RecurrenceDialog(recurrence)
        dialog.ShowDialog()

        '  If the dialog session was not canceled...
        If dialog.Result = RecurrenceDialogResult.Ok Then

            '  Reassign the 'recurrence' stack variable to now
            '  reference the instance that resulted from the dialog session.
            recurrence = dialog.DateRecurrence

            '  Get the first 10 occurrences generated by the recurrence
            Dim occurrenceDates As List(Of DateTime) = New List(Of DateTime)(10)

            Dim startDate As DateTime = DateTime.Today
            While occurrenceDates.Count < 10

                Dim nextOccurrence As Nullable(Of DateTime) = recurrence.GetDateOfNextOccurrence(startDate)
                If nextOccurrence.HasValue Then

                    occurrenceDates.Add(nextOccurrence.Value)
                    startDate = nextOccurrence.Value.AddDays(1)

                    If (startDate > recurrence.RangeEndDate) Then Exit While
                Else
                    Exit While
                End If

            End While

            '  Display a human-readable description of the recurrence
            '  along with the dates of the first 10 occurrences in a MessageBox
            Dim sb As New StringBuilder()
            sb.AppendLine(recurrence.Description)
            sb.AppendLine(Environment.NewLine)

            '  List the first 10 occurrences
            sb.AppendLine(String.Format("The first {0} occurrences are:", occurrenceDates.Count))
            sb.AppendLine(Environment.NewLine)
            Dim occurrenceDate As DateTime
            For Each occurrenceDate In occurrenceDates

                sb.AppendLine(occurrenceDate.ToShortDateString())
            Next

            '  Show the MessageBox.
            MessageBox.Show(sb.ToString(), recurrence.ToString(), MessageBoxButtons.OK)
        End If

    End Sub

C#

using System.Collections.Generic;
using Infragistics.Win;
using Infragistics.Win.UltraWinSchedule;
using System.Diagnostics;

    private void button1_Click(object sender, EventArgs e)
    {
        //  Create a new DateRecurrence on which the dialog session will be based.
        DateRecurrence recurrence = new DateRecurrence( new DateTime(DateTime.Today.Year, 1, 1) );
        recurrence.RangeEndDate = new DateTime(DateTime.Today.Year, 12, 31);

        //  Create and show the RecurrenceDialog in DateRecurrence mode
        RecurrenceDialog dialog = new RecurrenceDialog( recurrence );
        dialog.ShowDialog();

        //  If the dialog session was not canceled...
        if ( dialog.Result == RecurrenceDialogResult.Ok )
        {
            //  Reassign the 'recurrence' stack variable to now
            //  reference the instance that resulted from the dialog session.
            recurrence = dialog.DateRecurrence;

            //  Get the first 10 occurrences generated by the recurrence
            List<DateTime> occurrenceDates = new List<DateTime>(10);

            DateTime startDate = DateTime.Today;
            while ( occurrenceDates.Count < 10 )
            {
                Nullable<DateTime> nextOccurrence = recurrence.GetDateOfNextOccurrence( startDate );
                if ( nextOccurrence.HasValue )
                {
                    occurrenceDates.Add( nextOccurrence.Value );
                    startDate = nextOccurrence.Value.AddDays(1);

                    if ( startDate > recurrence.RangeEndDate )
                        break;
                }
                else
                    break;
            }

            //  Display a human-readable description of the recurrence
            //  along with the dates of the first 10 occurrences in a MessageBox
            StringBuilder sb = new StringBuilder();
            sb.AppendLine( recurrence.Description );
            sb.AppendLine( Environment.NewLine );

            //  List the first 10 occurrences
            sb.AppendLine( string.Format("The first {0} occurrences are:", occurrenceDates.Count) );
            sb.AppendLine( Environment.NewLine );
            foreach( DateTime occurrenceDate in occurrenceDates )
            {
                sb.AppendLine( occurrenceDate.ToShortDateString() );
            }

            //  Show the MessageBox.
            MessageBox.Show( sb.ToString(), recurrence.ToString(), MessageBoxButtons.OK );
        }
    }